Son of Mormon apartment managers studied at U of Utah. Operated a Wyoming hotel/gas station complex before buying 10% share in the business. Added refining as company expanded to Utah, Arizona; bought Sinclair Oil 1976. Now owns 3 refineries and more than 1,000 miles of pipeline worth more than $2 billion. Sold Barnett Shale exploration acreage to gas driller Chesapeake Energy for $300 million in the spring. Also resorts: his $300 million Sun Valley Ranch ski resort hosts Herb Allen's media mogul conference each year.

Distribution of Billionaires by Residence

Diameter of disc reflects size of fortune. The red disc indicates Robert Holding